Sinemydidae
Sinemydidae is an extinct family of turtles from the Jurassic and Cretaceous of East Asia. Their exact position is engimatic, they have alternatively been considered stem-group cryptodires, but also "crownward stem-turtles" alongside Macrobaenidae, Paracryptodira, Xinjiangchelyidae, Thalassochelydia and Sandownidae outside of crown Testudines.
Genera
- Dracochelys Lianmugin Formation, China, Early Cretaceous
- Hongkongochelys Upper Shaximiao Formation, China, Middle-Late Jurassic
- Jeholochelys Jiufotang Formation, China, Early Cretaceous
- Liaochelys Jiufotang Formation, China, Early Cretaceous
- Manchurochelys Yixian Formation, China, Early Cretaceous
- Ordosemys
- *O. leios Luohandong Formation, China, Early Cretaceous
- *O. liaoxiensis Chengzihe Formation, China, Early Cretaceous
- *O. brinkmania Lianmugin Formation, China, Early Cretaceous
- *O. perforata Khulsangol Formation, Mongolia, Early Cretaceous
- *O. donghai Chengzihe Formation, China, Early Cretaceous
- Sinemys
- *†Sinemys brevispinus Tong and Brinkman 2012 Laohongdong Formation, China, Early Cretaceous
- *†Sinemys chabuensis Ji and Chen 2018 Jingchuan Formation, China, Early Cretaceous
- *†Sinemys gamera Brinkman and Peng 1993 Luohandong Formation, China, Early Cretaceous
- *†Sinemys lens Wiman 1930 Mengyin Formation, China, Early Cretaceous
- Wuguia
- *†Wuguia efremovi Khozatsky 1996 Hutubei Formation, China, Hauterivian/Barremian Lianmuxin Formation, China, Early Cretaceous
- *†Wuguia hutubeiensis Matzke et al. 2004 Hutubei Formation, China, Hauterivian/Barremian
- Xiaochelys Lianmugin Formation, China, Early Cretaceous
- Yumenemys Hui-Hui-P'u, China, Late Cretaceous